@media screen and (max-width: 750px) {
    #content-wrapper {
       margin: 0px auto;
       max-width: 600px;
       min-width: 300px;
    }
    .third-image {
     float: left;
     width: 100%;
    }
    .banner{
      margin: 10px;
    }

    #content {
    margin: 0px;
  }
  .third-image a {
  display: block;
  margin: 5px 10px;
}
}